Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41ad96f2c98ea8f…

MALICIOUS

PDF

81.3 KB Created: 2021-02-22 05:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3f9407407a4dcaf9bfb16980a9ff7a2c SHA-1: 9934a1bfdde36bcafee76d12e2d788a134a392b9 SHA-256: a41ad96f2c98ea8f2742edad82cbc3476a756064fe1404f01a2c8d359e8eb422
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=rainbow+factor+pairs+worksheet PDF link annotation
    • http://pumba-timon.space/foruzojosolaguxozulqi4cw.pdfIn PDF document text
    • http://mosdendy.store/what_are_the_universal_standards_of_critical_thinkingxubyt.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/064718d.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/51788208638.pdfIn PDF document text
    • http://mon-cmb.best/wunder_von_bern_aufstellungaxlby.pdfIn PDF document text
    • http://arboozfilm.com/jio_play_store_apkelz4v.pdfIn PDF document text
    • http://logoped-samara.ru/warframe_crossplay_newsgnqdd.pdfIn PDF document text
    • https://zunotexiru.weebly.com/uploads/1/3/4/8/134890048/mekukul_dijexaleso_wigorulapuvero.pdfIn PDF document text
    • http://myirn.icu/los_tres_mosqueteros_alejandro_dumasrbzwe.pdfIn PDF document text
    • http://prizinsta365.site/tekiwomoxedivok8l8se.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/wusejeloxejupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/deleted_photos_backup_app.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/mitujipanovoki.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 5164 bytes
SHA-256: 75364b7cf18bbfd0455b420145313903d57c0dd91fdf15970f8c1a7b8f7ea9a3
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 10240 bytes
SHA-256: a14300eb015c04619a6e0e9afc7113a2854a96e5004e907322e5aeab81574d8b
font_02_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 16340 bytes
SHA-256: de4d8b2f57bd79f1a868fabda613d9936b110e31710edd4728466090b424b6ff
font_03_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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